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What are the materials of plastic bags?
1. PE (Polyethylene, PE), PE for short. It is a high molecular organic compound made of ethylene by addition polymerization. Polyethylene is recognized as the best food contact material in the world. Non-toxic, tasteless, odorless, in line with food packaging hygiene standards. Polyethylene film, light and transparent, with moisture-proof, oxygen resistance, acid resistance, alkali resistance, air tightness in general, excellent thermal sealing performance. Known as the "plastic flower" reputation. Is the plastic packaging printing amount, the most important material.
2. Polyvinyl chloride (PVC) for short, molecular formula (ch2-ch2cl)n, is the most important type of vinyl polymer, is the world's second largest plastic species after polyethylene. In the domestic production of plastics is in the first place. In the printing industry, polyvinyl chloride color calendering film and transparent glazing film are often used to make books, folders, tickets and other packaging decoration covers.
Shrinkfilm: Shrinkfilm is a thermoplastic film that is stretched and directed during production. Shrinkfilm shrinks when treated with hot air or infrared radiation. After heat treatment, the film is tightly wrapped on the packaging, the contraction force reaches the maximum in the cooling stage, and can be preserved for a long time.
Low density polyethylene, or LDPE for short, is the largest variety of plastic packaging and printing industry in various countries. Specific gravity is 0.92 ~ 0.93, can float in water. Crystallinity is low (60%), the pressure of 1000 ~ 3000 kg/C ㎡, bulk polymerization is also called high pressure polyethylene. In 23 ℃, the density of around 0.92. Poor calendering molding, suitable for blow-molding process into tubular film. Suitable for food packaging, fiber packaging, daily chemical products packaging.
5. High density polyethylene, or HDPE for short. The density is 0.941 ~ 0.965g/ cm3. With low pressure polymerization and become, reason calls low pressure polyethylene again. Milky white, indicating poor luster. The film can be processed by blow molding and t-die extrusion. Heat and cooking resistance, cold and freezing resistance, moisture resistance, gas resistance, good insulation performance, and not easy to damage, the strength of LDPE is two times. Easy to open. Strong paperlike, known as "paperlike plastic film".
6. Biaxial tensile polypropylene film, also known as biaxial tensile polypropylene film, abbreviated as BOPP, is characterized by molecular orientation of tensile, mechanical strength, folding strength, gas density, moisture resistance and better than ordinary plastic film. Compared with cellophane per unit area, the unit price is lower than cellophane. As a result of this film transparency is very good, the reproduction of color after printing is particularly bright and beautiful, plastic composite soft packaging is an important substrate.
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